Automatic interior lights control, function - GF82.20-P-2200FL
MODEL 212 without CODE 414 (Power glass tilting/sliding roof)
Function requirements, general
- No overvoltage or undervoltage (operating voltage range U ≥7 ≤ 17.5 V)
Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination (IBL), the warning and exit illumination and the load compartment illumination. The appropriate requests are generated automatically. The master control unit for the automatic interior lights control is the front SAM control unit.
The automatic interior lights control function encompasses the following subfunctions:
- Locator lighting function sequence
- Function sequence for orientation lighting
- Function sequence for warning and exit illumination
- Function sequence for load compartment illumination
- Function sequence for interior illumination with antitheft alarm system (ATA [EDW]) alarm (with code (551) Antitheft alarm system (ATA [EDW]))
- Function sequence for interior illumination following an accident with airbag deployment
Additional function requirements for locator lighting
- Automatic interior lights switched on via interior lamp automatic function switch
- Locking the vehicle via the central locking (CL [ZV])
Locator lighting function sequence
In order to control the locator lighting, the front SAM control unit reads in and evaluates in the following signals:
- Interior lamp automatic function switch status directly from overhead control panel electronics
- Status of central locking and circuit 15, sent by the electronic ignition lock control unit over the interior CAN
The overhead control panel electronics are supplied with voltage by the front SAM control unit.
The front SAM control unit therefore indirectly actuates the interior illumination components listed below:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp in rear dome lamp
The OFF delay time can be switched on or off via the "Settings" menu in the instrument cluster. The respective selection is sent by the instrument cluster via the interior CAN to the front SAM control unit.
If the ambient illumination function is activated via the instrument cluster, it automatically switches itself on via CL [ZV] when the vehicle is unlocked. This causes the "Standing lights actuation active" signal to be set, which also activates the search and symbol illumination. The search and symbol illumination function is described in a separate document.
On vehicles with code (954) Avantgarde or code (955) Elegance the front SAM control unit also actuates the following components in accordance with a defined brightness value:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp
- Right rear footwell lamp
Additional function requirements for orientation lighting
- Automatic interior lights switched on via interior lamp automatic function switch
- Circuit 15C OFF
Function sequence for orientation lighting
For control of the orientation lighting, the front SAM control unit reads in and evaluates the following signals:
- Interior lamp automatic function switch status
- Status of circuit 15, sent by the electronic ignition lock control unit over the interior CAN
The overhead control panel electronics are supplied with voltage by the front SAM control unit.
After circuit 15C is switched off, the front SAM control unit indirectly activates the interior illumination components listed below:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp in rear dome lamp
On vehicles with code (954) Avantgarde or code (955) Elegance the front SAM control unit also actuates the following components in accordance with a defined brightness value:
- Right front footwell lamp
- Left front footwell lamp
- Left rear footwell lamp
- Right rear footwell lamp
If leaving the vehicle intentionally, all the lamps are switched off after t = 15 s. The OFF delay time can be switched on or off via the "Settings" menu in the instrument cluster. The respective selection is sent by the instrument cluster via the interior CAN to the front SAM control unit.
Function sequence for warning and exit illumination
The warning and exit illumination is activated by opening a vehicle door.
In order to control the warning and exit illumination, the front SAM control unit reads in and evaluates the following signals:
- Status of left front door rotary tumbler switch in left front door lock from left front door control unit via interior CAN
- Status of right front door rotary tumbler switch in right front door lock from right front door control unit via interior CAN
- Status of left rear door rotary tumbler switch in left rear door lock and status of right rear door rotary tumbler switch in right rear door lock from rear SAM control unit via interior CAN
The front SAM control unit transmits the request to switch on the warning and exit illumination as well as the interior illumination via the interior CAN to the following control units:
- Left front door control unit
- Right front door control unit
- Left rear door control unit
- Right rear door control unit
The following components of the warning and exit illumination are actuated directly according to the door status:
- Left front door exit and warning lamp by the left front door control unit
- Right front door exit and warning lamp by the right front door control unit
- Left rear door exit and warning lamp by the left rear door control unit
- Right rear door exit and warning lamp by the right rear door control unit
Model 212.074/077/092/274/277/292:
The front SAM control unit also sends the request to switch on the warning and exit illumination via chassis CAN (up to 28.2.13) or chassis CAN 1 (as of 1.3.13) to the transmission mode control unit.
The transmission mode control unit then actuates the following components in accordance with the door status:
- Left front illuminated door sill molding voltage converter and thus the left front illuminated door sill molding
- Right front illuminated door sill molding voltage converter and thus the right front illuminated door sill molding
The front illuminated door sill molding voltage converters supply the front illuminated door sill moldings with voltage. The luminescent films of the front illuminated door sill moldings work with an operating voltage of U = 130 V. The power supply of the front illuminated door sill moldings is interrupted after max. t = 5 min.
If, as the result of a malfunction at the front illuminated door sill moldings, a front illuminated door sill molding voltage converter detects a load that is either too high or too low, it switches off the high-voltage output immediately for safety reasons.
The following components of the interior illumination are actuated indirectly through the power supply for the overhead control panel electronics via the front SAM control unit in accordance with the status of the interior lamp automatic function switch:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp in rear dome lamp
All footwell lamps are also actuated by the front SAM control unit. If all the vehicle doors are closed again and the circuit status of circuit 15 On has been sent by the electronic ignition lock control unit over the interior CAN, then the interior lights are switched off. The footwell lamps are then actuated again at the defined brightness value.
To preserve the on-board electrical system battery (G1), with circuit 15 Off all the activated lamps are switched off after t = 5 min. when a vehicle door is open and t = 8 s after the closing of the last vehicle door.
Additional load compartment illumination function requirements
- Vehicle stationary
- Trunk lid (model 212.0/1) or liftgate (model 212.2) open
- Rain/light sensor reports "Darkness detected" (only control of the trunk lid or liftgate ambient illumination)
Function sequence for load compartment illumination
To control the load compartment illumination, the front SAM control unit reads in and evaluates the following signals:
- Data of the rain/light sensor via wiper/inside rearview mirror LIN
- Status of trunk lid rotary tumbler switch in trunk lid central locking motor (model 212.0/1) or status of liftgate rotary tumbler switch in liftgate central locking motor (model 212.2) via interior CAN from rear SAM control unit
The front SAM control unit transmits the request to switch on the load compartment illumination via the interior CAN to the rear SAM control unit, which then actuates the following load compartment illumination components:
- Right trunk lamp (dimmed)
- Left trunk lamp (dimmed)
- Trunk lid ambient lamp (undimmed) (model 212.0/1) or left liftgate ambient lamp and warning lamp (undimmed) (model 212.2)
- Right liftgate ambient lamp and warning lamp (undimmed) (model 212.2)
To preserve the on-board electrical system battery, the ambient lamps and the trunk lamps are switched off t = 10 min. after the trunk lid or liftgate has been opened.
The rear SAM control unit is provided with the status of the front doors by the front door control units and the current status of circuit 15 by the electronic ignition lock control unit via interior CAN so that the load compartment illumination can be activated again at the end of a journey with the trunk lid or liftgate open. The ambient lamps and the trunk lamps are switched off after the trunk lid or the liftgate is closed.
Additional function requirements for interior illumination with ATA [EDW] alarm (with code (551) Antitheft alarm system (ATA [EDW]))
- ATA [EDW] alarm activated
Function sequence for interior illumination with ATA [EDW] alarm (with code (551) Antitheft alarm system (ATA [EDW]))
The interior illumination is activated immediately after an ATA [EDW] alarm has been triggered. The rear SAM control unit transmits the "ATA [EDW] alarm triggered" signal via interior CAN to the front SAM control unit.
The following components of the interior illumination are actuated indirectly by the front SAM control unit through the power supply for the overhead control panel electronics:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp in rear dome lamp
Furthermore, the front SAM control unit actuates all footwell lamps.
Additional function requirements for interior illumination following an accident with airbag deployment
- Airbag deployment by the supplemental restraint system control unit
- Vehicle speed v = 0 km/h
Function sequence for interior illumination following an accident with airbag deployment
The interior illumination is actuated in order to provide better orientation for the occupants and the first air personnel following an accident. If the supplemental restraint system control unit recognizes a crash event, it sends the crash signal via chassis CAN (up to 28.2.13) or chassis CAN 1 (as of 1.3.13) to the front SAM control unit. The instrument cluster sends the vehicle speed to the front SAM control unit via interior CAN. The front SAM control unit receives these signals and evaluates them.
The following components of the interior illumination are actuated indirectly by the front SAM control unit through the power supply for the overhead control panel electronics:
- Left front interior lamp
- Right front interior lamp
- Rear interior lamp in rear dome lamp
Furthermore, the front SAM control unit actuates all footwell lamps. The interior illumination function following an accident with airbag deployment is deactivated under the following conditions:
- Hazard warning flasher switch operated in the instrument panel switch group or hazard warning system button pressed in upper control panel control unit. The front SAM control unit reads in the status of the hazard warning flasher switch or the hazard warning system button via instrument panel LIN.
- Unlocking the CL [ZV]
- Status of circuit 15R changes to circuit 15 On
- Opening a vehicle door
| Automatic interior lights control electrical function schematic | MODEL 212 without CODE 414 (Power glass tilting/sliding roof) | PE82.20-P-2052-97DAA | |
| Overview of interior illumination (IBL) system components | GF82.20-P-9997FL |